/gsuite.google.com/ Previously i think called Google business or something.
Well i use that to send and receive email on my thunderbird.
I use that to send email from my wordpress site (registration emails/forgot pass/etc)
I use that to send email from my phpbb forum.

My question is. DO i still need this services running or can i disable them all since i'm not using them:

Also, ensure any scripts that use email functionality (e.g. WordPress) are configured to send through the remote mail server. You may need to disable "WHM >> SMTP Restrictions" if you are currently using that feature.